JP2005326461A - Display device and driving control method of the same - Google Patents

Display device and driving control method of the same Download PDF

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JP2005326461A
JP2005326461A JP2004142201A JP2004142201A JP2005326461A JP 2005326461 A JP2005326461 A JP 2005326461A JP 2004142201 A JP2004142201 A JP 2004142201A JP 2004142201 A JP2004142201 A JP 2004142201A JP 2005326461 A JP2005326461 A JP 2005326461A
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display
display panel
scanning
signal voltage
sub
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JP2004142201A
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JP4501525B2 (en
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Tomomi Kamio
知巳 神尾
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Casio Comput Co Ltd
カシオ計算機株式会社
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    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611Control of matrices with row and column drivers
    • G09G3/3614Control of polarity reversal in general
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611Control of matrices with row and column drivers
    • G09G3/3648Control of matrices with row and column drivers using an active matrix
    • G09G3/3666Control of matrices with row and column drivers using an active matrix with the matrix divided into sections
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611Control of matrices with row and column drivers
    • G09G3/3674Details of drivers for scan electrodes
    • G09G3/3677Details of drivers for scan electrodes suitable for active matrices only
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02Details of power systems and of start or stop of display operation
    • G09G2330/021Power management, e.g. power saving
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M2250/00Details of telephonic subscriber devices
    • H04M2250/16Details of telephonic subscriber devices including more than one display unit

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device and a driving control method of the same capable of reducing power consumption by reducing a driving period (driving frequency) in reverse driving of a common signal voltage applied to each display panel in the display device employing two or more display panels. <P>SOLUTION: In the display device, a main display panel 10m and a sub-display panel 10s having prescribed lines of scanning line groups Lsm and Lss are driven by a main scanning driver 30m and a sub-scanning driver 30s. By repeating control operations that, after i rows of scanning lines of the main display panel 10m are scan-driven, j rows of scanning lines of the sub-display panel 10s are scan-driven with timing according to a ratio (i:j) of the number of scanning lines, by turns between the main display panel 10m and the sub-display panel 10s, a display signal voltage is sequentially written in liquid crystal display pixels in each row of the main display panel 10m and sub-display panel 10s. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a display device and a drive control method thereof, and more particularly, to a display device including two or more display panels and a drive control method thereof.

  In recent years, digital information devices such as personal computers, digital cameras, mobile phones, and DVD recorders have been widely used. Such a digital information device is equipped with a display device for displaying various image information, the operation state of the device, and the like. For example, a mobile phone has a foldable housing structure in recent years, and has a relatively large main display provided on the operation surface side (housing inner surface side), on the back side (housing outer surface side). However, those with relatively small sub-displays are the mainstream.

Here, a display device having two display panels in the prior art will be described.
FIG. 6 is a schematic configuration diagram illustrating an example of a display device including two display panels in the related art. Here, a configuration including a relatively large display panel and a relatively small display panel as in the above-described mobile phone is shown. In addition, a configuration in which a liquid crystal display panel corresponding to an active matrix driving method in which liquid crystal display pixels are two-dimensionally arranged as a display panel is shown.

  For example, as shown in FIG. 6, the display device according to the prior art is arranged in the row direction of two types of display panels PNL1 and PNL2, which are at least different in the number of scanning lines and are arranged in parallel, and the display panels PNL1 and PNL2. A gate driver (scan driver) GDR that sequentially applies a scan signal to each of the scan line groups SLm and SLs, and a display signal (for example, a luminance signal) corresponding to the data line group DLm arranged in the column direction of the display panel PNL1 Source driver (data driver) SDR for applying a display signal voltage) and common voltage generation for applying common signal voltages Vcom1 and Vcom2 to a common electrode (common electrode; not shown) provided in each of the display panels PNL1 and PNL2. Part (common voltage drive part) COM1 and COM2.

Here, in the display device including two display panels PNL1 and PNL2 having different panel sizes, some of the data line groups DLs among the data line groups DLm extending from the source driver SDR to the display panel PNL1 are displayed. The display panel PNL2 extends through the panel PNL1, and the data line group DLs is shared by the two display panels PNL1 and PNL2.
In the display device shown in FIG. 6, the configuration in which the panel sizes (number of scanning lines) of the two display panels PNL1 and PNL2 are different is shown. For example, two display panels having the same panel size are provided. It may be a thing.

  Further, the gate driver GDR may have a form of a separate driver chip corresponding to each scanning line group SLm, SLs arranged in the display panels PNL1, PNL2, as shown in FIG. It may have a form of a single dry chip. That is, it is only necessary that the scanning signal can be sequentially applied to all the scanning lines by a plurality of stages of shift signal generation units provided in the gate driver GDR.

  Further, the common voltage generators COM1 and COM2 that apply the common signal voltages Vcom1 and Vcom2 to the common electrodes of the display panels PNL1 and PNL2, respectively, correspond to the display panels PNL1 and PNL2, as shown in FIG. It may have a configuration provided individually, or may apply individual common signal voltages Vcom1 and Vcom2 to the display panels PNL1 and PNL2 from a single common voltage generator.

  A display device having such a configuration is described in detail, for example, in Patent Document 1 and the like. That is, as shown in FIG. 6, for example, Patent Document 1 discloses a display panel PNL 1 having 240 scanning lines and 528 data lines (176 × RGB), 64 scanning lines, Among the data line groups DL1 to DL528 extending from the source driver SDR, the data line groups DL1 to DL264 include two display panels PNL1, It has a configuration shared by PNL2.

FIG. 7 is a timing chart showing an example of a display drive control method for a display device in the prior art.
For example, as shown in FIG. 7, the display drive control method in the display device as described above is as follows. First, from the gate driver GDR, the scan line group SLs (SL1 to SL64) of the display panel PNL2 having a small panel size is applied. The scanning signals S1 to S64 are sequentially applied and selectively driven, and in synchronization with this timing, the display signals D1 to D264 corresponding to the respective rows of the display panel PNL2 are supplied from the source driver SDR to the data line group DLs (DL1 to DL264). After supplying and writing to the display pixels of each row, the scanning signals S65 to S304 are sequentially applied to the scanning line group SLm (SL65 to SL304) of the display panel PNL1 having a large panel size and selectively driven. In synchronization with the timing, it corresponds to each line of the display panel PNL1 from the source driver SDR A display signal D1~D528 was, by writing supplied to the data line group DLm (DL1~DL528) to the display pixel in each row, in each of the display panel PNL1 and PNL2, desired image information is displayed.

Here, after a display data is written to the display panel PNL2 described above, a series of display drive control operations for writing a display signal to the display panel PNL1 are sequentially executed with one frame period as one cycle as shown in FIG. . That is, a driving method is adopted in which individual operation periods for displaying and driving the display panels PNL1 and PNL2 are set in time series (serial) in one frame period.
In the display drive control method shown in FIG. 7, the case where the display signal is written to the display panel PNL1 having a large panel size after the display signal is written to the display panel PNL2 having a small panel size has been described. After the display signal is written to the display panel PNL2, the display signal may be written to the display panel PNL2.

JP-A-2003-323164 (FIGS. 7-9, pages 6-7)

However, the conventional techniques as described above have the following problems.
That is, in the display device described in Patent Document 1 and the like, as shown in FIG. 7, one frame period is set as one cycle, and display signals are sequentially written into the display panels PNL2 and PNL1, and every one frame period. , The control operation of the frame inversion drive method for inversion control of the signal polarity of the common signal voltage Vcom (Vcom1, Vcom2) is described.
In such a frame inversion driving method, as is well known, the voltage polarity applied to the liquid crystal molecules constituting the display pixel (pixel capacitance) is maintained at a specific polarity for a relatively long period of one frame period. As a result, deterioration of the liquid crystal, burn-in, display image quality deterioration due to flicker, and the like occur. To suppress such a phenomenon, for example, a frame (or field) inversion drive and a line (row) inversion drive system are used. It is desirable to apply.

  FIG. 8 is a timing chart when the display device according to the related art is driven to display by frame inversion and line inversion driving. Here, for the sake of comparison with the embodiment of the invention described later, the display device shown in FIG. 6 has 320 scanning lines as the display panel PNL1, 160 scanning lines as the display panel PNL2, and the same number of data. A case of having a line and writing a display signal to the display panel PNL2 after writing a display signal to the display panel PNL1 in one frame period will be described.

  That is, for example, as shown in FIG. 8, after the first to 320th lines of the display panel PNL1 are scanned by the gate driver GDR in one frame period, the first to 160th lines of the display panel PNL2 are scanned. Scan. In synchronization with the driving timing of each row (scanning line), the source driver SDR supplies display signals all at once via the data lines, and the signal polarities of the common signal voltages Vcom1 and Vcom2 (for each line). Is reversed. Further, inversion control is performed on the signal polarities of the common signal voltages Vcom1 and Vcom2 for each frame period. As a result, a display cycle having the number of scanning lines 480 (= 320 + 160), which is the total number of the display panels PNL1 and PNL2, is equivalent to a driving cycle equivalent to a case where frame inversion driving and line inversion driving are performed. The common signal voltages Vcom1 and Vcom2 are inverted and driven at (frequency).

  In FIG. 8, BP (back porch) is the non-display period from the vertical synchronization timing (start timing of one frame period) to the display effective period of the display panel PNL1, and MP (middle porch) is the display effective period of the display panel PNL1. FP (front porch) is a non-display period from the display effective period of the display panel PNL2 to the next vertical synchronization timing, which is a so-called vertical blanking period. Show.

  In the frame inversion driving method and the line inversion driving method as described above, for example, even when only one of the two display panels PNL1 and PNL2 is driven to display, the display panels PNL1 and PNL2 of both the display panels are always operated. It is necessary to continue to apply the common signal voltages Vcom1 and Vcom2 to the common electrode.

That is, when only one of the display panels (for example, the display panel PNL1) is driven for display, the other display panel (for example, the display panel PNL2) is driven in a driving state substantially equivalent to the vertical blanking period ( (Hidden state) is set. In this case, in order to reduce power consumption in the display panel (display panel PNL2) in the non-display state (during the vertical blanking period), inversion driving of the common signal voltage (Vcom2) supplied to the common electrode of the display panel is performed. When the display is stopped, the charge held in the display pixels in the display state leaks, causing striped noise on the display screen and degrading the display image quality. The inversion drive could not be stopped.
For this reason, it has been necessary to continuously apply the common signal voltage to both display panels and to perform inversion driving at a predetermined cycle, which causes a problem that power consumption for driving control of the common signal voltage increases. It was.

  Therefore, in view of the above-described problems, the present invention reduces power consumption by reducing a driving cycle (frequency) related to inversion driving of a common signal voltage applied to each display panel in a display device including two or more display panels. An object of the present invention is to provide a display device and a drive control method for the display device that can reduce the amount of power consumption.

  The invention according to claim 1 is provided with display means having a plurality of display panels formed by two-dimensionally arranging a plurality of display pixels, sequentially scanning the display pixels in each row of the display panel, and displaying signals based on predetermined image signals In a display device that displays desired image information by frame inversion driving and line inversion driving of the voltage and the common signal voltage, in each of the plurality of display panels, each display panel has at least one scanning period. It is characterized by comprising display drive means for repeating the control operation of sequentially scanning the display pixels in a number of rows corresponding to the ratio of the number of scanning lines provided between the respective display panels.

According to a second aspect of the present invention, there is provided the display device according to the first aspect, wherein the display driving means is configured such that, in each of the plurality of display panels, at least the total signal polarity of the common signal voltage in the one scanning period is A common signal driving unit is provided for setting the number of times of inversion driving of the common signal voltage so as to be equal.
According to a third aspect of the present invention, in the display device according to the second aspect, the common signal driving unit determines the number of times of inversion driving of the common signal voltage by the number of scanning lines provided in each of the plurality of display panels. It is set to be the same.

  According to a fourth aspect of the present invention, in the display device according to any one of the first to third aspects, the display driving means is connected to at least a signal line provided in common to the plurality of display panels, and the display A single signal driver that applies a signal voltage, and an individual scan driver that is connected to the scan line provided for each of the plurality of display panels and sequentially applies a scan signal to scan the display pixels. It is characterized by comprising.

According to a fifth aspect of the present invention, in the display device according to the fourth aspect, the display driving means includes at least a control unit that controls operating states of the signal driving unit, the scanning driving unit, and the common signal driving unit. It is characterized by doing.
According to a sixth aspect of the present invention, in the display device according to any one of the first to fifth aspects, the display means has at least a ratio of the number of the scanning lines of i: j (i and j are arbitrary positive numbers). The display driving means sequentially scans i rows of the display pixels in the first display panel during the one scanning period. Control is performed such that the operation and the operation of sequentially scanning the display pixels for j rows in the second display panel are alternately repeated.

  According to a seventh aspect of the present invention, in the display device according to any one of the first to fifth aspects, the display means has at least a ratio of the number of the scanning lines i: j (i and j are arbitrary positive numbers). A first display panel and a second display panel that are approximate to an integer), and the display driving means sequentially scans the display pixels for i rows in the first display panel during the one scanning period. And the operation of sequentially scanning the display pixels for j rows in the second display panel are controlled to be repeated alternately.

  According to an eighth aspect of the present invention, in the display device according to the sixth or seventh aspect, the common signal driving unit is configured to detect the second display panel during a period of scanning the display pixels of the first display panel. Setting the signal polarity of the second common signal voltage applied to the common electrode to the same polarity as the signal polarity of the second common signal voltage when the display pixel of the second display panel is next scanned; In the period of scanning the display pixels of the second display panel, the signal polarity of the first common signal voltage applied to the common electrode of the first display panel is set to the signal of the second common signal voltage. It is characterized by being set to the same polarity as the polarity.

  The invention according to claim 9 is provided with display means having a plurality of display panels formed by two-dimensionally arranging a plurality of display pixels, sequentially scanning the display pixels in each row of the display panel, and displaying signals based on predetermined image signals In a display device drive control method for displaying desired image information by performing frame inversion drive and line inversion drive on a voltage and a common signal voltage, each of the plurality of display panels includes at least one scanning period. A control operation of sequentially scanning the display pixels in a number of rows corresponding to the ratio of the number of scanning lines provided in each display panel is alternately repeated between the display panels, and the plurality of display panels When scanning the display pixels, in each of the plurality of display panels, the number of times the common signal voltage is inverted is driven so that the sum of the signal polarities of the common signal voltage is equal. Characterized in that it comprises a process of setting, the.

  According to a tenth aspect of the present invention, in the drive control method for a display device according to the ninth aspect, the process of setting the number of times of inversion driving of the common signal voltage is performed by setting the number of times of inversion driving of the common signal voltage to the plurality of display panels In this case, the number of scanning lines is set to be the same as the number of scanning lines provided in each of the above.

  According to an eleventh aspect of the present invention, in the display device drive control method according to the ninth or tenth aspect, the display means has at least a ratio of the number of the scanning lines of i: j (i and j are arbitrary positive numbers). The first display panel and the second display panel, each of which is an integer), and in each of the plurality of display panels, the process of alternately repeating the control operation of sequentially scanning the display pixels is performed during the one scanning period. In addition, the operation of sequentially scanning the display pixels for i rows in the first display panel and the operation of sequentially scanning the display pixels for j rows in the second display panel are alternately repeated. Features.

  According to a twelfth aspect of the present invention, in the display device drive control method according to the ninth or tenth aspect of the present invention, the display means has at least a ratio of the number of scanning lines of i: j (i and j are arbitrary positive numbers). The first display panel and the second display panel approximate to an integer), and the process of alternately repeating the control operation of sequentially scanning the display pixels in each of the plurality of display panels is the one scanning period. The operation of sequentially scanning the display pixels for i rows in the first display panel and the operation of sequentially scanning the display pixels for j rows in the second display panel are alternately repeated. It is characterized by.

  According to a thirteenth aspect of the present invention, in the display device drive control method according to the eleventh or twelfth aspect, the process of setting the number of times of inversion driving of the common signal voltage scans the display pixels of the first display panel. In the period, the signal polarity of the second common signal voltage applied to the common electrode of the second display panel is set to the second common signal when the display pixel of the second display panel is scanned next time. The signal polarity of the first common signal voltage applied to the common electrode of the first display panel during the period of scanning the display pixels of the second display panel is set to the same polarity as the signal polarity of the voltage. Is set to the same polarity as the signal polarity of the second common signal voltage.

  That is, the display device and the drive control method thereof according to the present invention include two or more display panels (for example, the first display panel and the second display) in which a plurality of display pixels such as liquid crystal display pixels are two-dimensionally arranged. Panel), a signal driver (data driver) connected to a signal line (data line) group commonly provided in the plurality of display panels, and each of the plurality of display panels. A plurality of scanning driving units (scanning drivers) individually connected to the scanning line group, and a common signal driving unit (common signal driving circuit) for applying individual common signal voltages to the common electrodes provided in each of the plurality of display panels ), And a display drive means comprising a control unit (LCD controller) for controlling the operation state of the signal drive unit, the scan drive unit, and the common signal drive unit, and sequentially runs display pixels in each row of the display panel The display device displays desired image information by selectively driving and applying a display signal voltage and a common signal voltage based on a predetermined image signal to the display pixels of each row by frame inversion driving and line inversion driving. In the above, for example, the ratio i: j (i) of the number of scanning lines provided in each of the first display panel and the second display panel during one scanning period provided in one frame period by the display driving means. , J is an arbitrary positive integer), an operation for sequentially scanning display pixels for i rows on the first display panel, and an operation for sequentially scanning display pixels for j rows on the second display panel. The first and second commons are repeated so that the sum of the signal polarities of the first and second common signal voltages applied to each of the first and second display panels becomes equal. It is configured to set the inversion driving number of the signal voltage.

  Here, the number of times of inversion driving of the first and second common signal voltages is set to be the same as the number of scanning lines provided in each of the first and second display panels, for example. In addition, when the ratio of the number of scanning lines provided in the first and second display panels does not become an integer ratio, i rows are divided between the first and second display panels based on the approximate integer ratio. The operation of sequentially scanning the display pixels for j rows may be alternately repeated.

  According to this, a display signal voltage (luminance signal) and a common signal voltage are applied to a plurality of (2) display panels by frame inversion driving and line inversion driving to display each display pixel. In this case, the control operation of sequentially scanning the display pixels of a predetermined number of rows (i rows and j rows) in each display panel according to the ratio of the number of scanning lines is alternately performed between the plurality of display panels. By repeating and setting the number of inversion driving times of the common signal voltage so that the sum of the signal polarities of the common signal voltage applied to each of the display panels becomes equal, direct current to the liquid crystal constituting the display pixel is set. The application of components can be suppressed, and the number of times of inversion driving of the common signal voltage can be reduced compared to the total number of scanning lines of each display panel. It is possible to reduce the power consumption of the inversion driving.

  In particular, when the display pixels of the first display panel are driven to scan, the signal polarity of the second common signal voltage applied to the second display panel is changed to the next time the display pixels of the second display panel are driven to scan. When the display pixel of the second display panel is set to the same polarity as the signal polarity of the second common signal voltage, the first common signal voltage applied to the first display panel is scanned. By setting the signal polarity to the same polarity as the signal polarity of the second common signal voltage, the first common signal voltage applied to the first display panel when both display panels are scanned and driven in one scanning period The number of times of inversion driving can be made the same as the number of scanning lines of the first display panel, and the number of times of inversion driving of the second common signal voltage applied to the second display panel is set to the second display panel. Scanning Because may be the same as in the number (can be reduced), it is possible to further reduce power consumption of the reverse driving of the common signal voltage.

Hereinafter, embodiments of a display device and a drive control method thereof according to the present invention will be described in detail.
<Overall configuration>
First, the overall configuration of the display device according to the present invention will be described.
FIG. 1 is an overall configuration diagram showing an embodiment of a display device according to the present invention.

  As shown in FIG. 1, the display device according to the present invention is roughly divided into a main display panel (first display panel) 10m and a sub display in which a plurality of liquid crystal display pixels are two-dimensionally arranged and each have a predetermined panel size. Common to the panel (second display panel) 10s, the main display panel 10m, and the sub display panel 10s, the data line group Ld arranged to extend in the column direction, and connected to the data line group Ld A single data driver (source driver; signal driving unit) 20, scanning line groups Lsm and Lss arranged to extend in the row direction of the main display panel 10 m and the sub display panel 10 s, A main scanning driver (referred to as “main driver” for convenience of illustration; a scanning driving unit) 30m connected to the scanning line group Lsm of the display panel 10m, and a sub display panel A sub-scan driver (referred to as “sub-driver” for convenience of illustration; a scan driver) 30 s connected to the scan line group Lss of 10 s; a display signal generation circuit 40 including an RGB decoder 41 and an inverting amplifier 42; A main common signal drive circuit for applying a main common signal voltage (first common signal voltage) Vcomm to the common electrode (opposite electrode) of the display panel 10m (for convenience of illustration, referred to as “main drive unit”; common signal drive unit) ) 60 m and a sub-common signal drive circuit for applying a sub-common signal voltage (second common signal voltage) Vcoms to the common electrode of the sub-display panel 10s (for convenience of illustration, it is referred to as “sub-drive unit”; common signal drive unit) 60s, at least the data driver 20, the main scanning driver 30m, the sub-scanning driver 30s, and the main common signal driving circuit 6 An LCD controller (control unit) 50 for supplying a predetermined control signal to the m and Sabukomon signal driving circuit 60s, and is configured with a.

  Although not shown, when the main display panel 10m and the sub display panel 10s are transmissive liquid crystal display panels, a cold cathode ray tube or the like is provided on the back side of the main display panel 10m and the sub display panel 10s. A backlight comprising a light source and a light guide plate such as an acrylic plate is provided.

Hereinafter, each configuration will be described in detail.
Each of the main display panel 10m and the sub display panel 10s is a liquid crystal display panel having a panel structure corresponding to a well-known active matrix type driving method, and is arranged between opposing transparent substrates in directions orthogonal to each other. A plurality of liquid crystal displays arranged near the intersections of the data line group Ld and the scanning line group Ls, and the data line group Ld and the scanning line group Ls, and connected to the data line group Ld and the scanning line group Ls, respectively. Pixels (pixel transistors, pixel capacitors, and auxiliary capacitors).

  Here, FIG. 1 shows the case where the number of data lines arranged on the main display panel 10m and the sub display panel 10s is set to be the same, but as shown in the prior art (see FIG. 6), The number of data lines arranged on the sub display panel 10s may be set smaller than that of the main display panel 10m.

  The main display panel 10m, the sub display panel 10s, the data line group Ld, and the scanning line group Ls have, for example, a configuration mounted (mounted) on a single flexible printed board. In addition, the data driver 20, the main scanning driver 30m, and the sub scanning driver 30s, which will be described later, may also be configured to be mounted on the flexible printed circuit board.

  The data driver 20 is connected to the data line group Ld arranged in common to the main display panel 10 m and the sub display panel 10 s, and from the display signal generation circuit 40 based on a horizontal control signal supplied from the LCD controller 50. For example, R (red), G (green), and B (blue) luminance signals (display signals) to be supplied are captured and held in units of one row, and display signal voltages corresponding to the luminance signals are stored in a data line group. Ld all at once.

  The main scanning driver 30m and the sub-scanning driver 30s are connected to the scanning line groups Lsm and Lss arranged in the main display panel 10m and the sub-display panel 10s, respectively, and are controlled vertically by the LCD controller 50. Based on the signal, a predetermined scanning signal (selection signal) is sequentially applied to each scanning line of the main display panel 10m and the sub display panel 10s to make a selection state. Thus, in synchronization with the selection timing, the display signal voltage corresponding to the luminance signal is applied from the data driver 20 to the liquid crystal display pixel at the position intersecting with the data line group Ld, so that the row (scan line). The display signal voltage is written in the liquid crystal display pixels.

  In particular, in the main scan driver 30m and the sub scan driver 30s according to the present invention, the panel size (scan line) is different from the two main display panels 10m and sub display panels 10s having different panel sizes (number of scan line groups). Of the main display panel 10m at a timing according to the ratio (i: j; i, j are arbitrary positive integers), and sequentially driving the scan signals for i rows of the main display panel 10m, The control operation of sequentially applying scanning signals by sequentially applying scanning signals to the j rows of scanning lines of the sub display panel 10s is alternately repeated between the main display panel 10m and the sub display panel 10s, whereby the main display panel 10m and the sub display are displayed. The display signal voltage corresponding to the luminance signal is sequentially written to the liquid crystal display pixels in each row of the panel 10s. Here, the functions of the display drive unit according to the present invention including the main scan driver and the sub scan driver will be described in detail in a drive control method to be described later.

  In FIG. 1, functional blocks showing a schematic configuration of the display device according to the present invention are shown. Therefore, the main scanning driver 30 m and the sub scanning driver 30 s provided corresponding to each display panel are shown as individual configurations. However, it may have a configuration in which these scanning drivers are integrally provided in a single driver chip, or may have a configuration in which individual driver chips are provided as illustrated.

  The RGB decoder 41 constituting the display signal generation circuit 40 extracts, for example, R, G, and B color signals (RGB signals) from an image input signal supplied from the outside of the display device, and outputs them to the inverting amplifier 42. Further, the inverting amplifier 42 inverts the polarity of the RGB signal extracted by the RGB decoder 41 based on the polarity inversion signal (frame / line inversion signal) FRPp supplied from the LCD controller 50, and outputs the RGB inversion signal. It is generated and output to the data driver 20 as a luminance signal (analog signal).

  The LCD controller 50 supplies the polarity inversion signal FRPp, and the like based on the horizontal synchronization signal H and the vertical synchronization signal V supplied from the outside of the display device (or extracted from the image input signal by the RGB decoder 41). Polarity inversion signals FRPm and FRPs are generated and individually supplied to the inverting amplifier 42 and a main common signal driving circuit 60m and a sub-common signal driving circuit 60s described later, and a horizontal control signal and a vertical control signal are generated, respectively. By supplying the data driver 20, the main scanning driver 30m, and the sub-scanning driver 30s, a display signal voltage corresponding to a luminance signal is applied to each liquid crystal display pixel (pixel electrode side) at a predetermined timing, and the main display panel 10m. And predetermined image information based on the image input signal is displayed on the sub display panel 10s. Performs control of.

  Here, the LCD controller 50 according to this embodiment includes a horizontal control signal and a vertical control signal supplied to the data driver 20 and the main scanning driver 30m, the sub-scanning driver 30s, an inverting amplifier 42, and a main common signal driving circuit 60m. By controlling the polarity inversion signals FRPp, FRPm, and FRPs supplied to the sub-common signal drive circuit 60s, a drive control operation unique to this embodiment as described later is executed. In particular, an operation of scanning each row of the main display panel 10m and the sub display panel 10s (applying a scan signal to the scan line) in a scanning period in which the display signal voltage is written to the main display panel 10m and the sub display panel 10s is performed by a predetermined number. The vertical control signal is set so as to switch alternately between the main scanning driver 30m and the sub scanning driver 30s for each row and to repeat alternately.

  The main common signal drive circuit 60m and the sub common signal drive circuit 60s are connected to the common electrodes provided in the main display panel 10m and the sub display panel 10s, respectively, and are connected to the polarity inversion signals FRPm and FRPs output from the LCD controller 50. Based on the main common signal voltage Vcomm and the sub common signal set so that the signal polarity is inverted with respect to the display signal voltage applied to each liquid crystal display pixel (pixel electrode) of the main display panel 10m and the sub display panel 10s. A voltage Vcoms is applied to each common electrode.

Next, a drive control operation in the display device having the above-described configuration will be described with reference to the drawings. Here, the following drive control operation (display drive control method) is executed based on various control signals supplied from the LCD controller 50 described above.
<First Embodiment>
FIG. 2 is a timing chart showing the first embodiment of the drive control operation (drive control method) in the liquid crystal display device according to the present invention. Here, in the display device having the above-described configuration (see FIG. 1), the number of scanning lines arranged on the main display panel 10m is 320, and the number of scanning lines arranged on the sub display panel 10s is 160. A drive control method when the ratio of the panel size (number of scanning lines) is set to 2: 1 will be described. The number of data lines is arbitrary in both the main display panel 10m and the sub display panel 10s, and is the same in this embodiment.

  In the display device drive control method according to the present embodiment, as shown in FIG. 2, in one scanning period within one frame period, first, a vertical control signal supplied from the LCD controller 50 by the main scanning driver 30m at timing T1. Based on the above, the high level scanning signal S1m is applied to the first scanning line of the main display panel 10m, and then the high level scanning signal S2m is sequentially applied to the second scanning line at timing T2.

  In synchronization with this timing, the display signal voltage corresponding to the liquid crystal display pixels in the first row of the main display panel 10m from the data driver 20 at the timing T1, and the liquid crystal display in the second row of the main display panel 10m at the timing T2. A predetermined luminance signal is sequentially written in the first row and the second row of the main display panel 10m by simultaneously applying display signal voltages corresponding to the pixels through the respective data lines.

  Here, the display signal voltage applied at timing T1 is set to a signal voltage that is positive with respect to a predetermined display center voltage, and the display signal voltage applied at timing T2 is relative to the display center voltage. The signal voltage is set to be negative. Further, the main common signal voltage Vcomm applied from the main common signal driving circuit 60m to the common electrode of the main display panel 10m becomes a signal voltage (low level) having a negative polarity with respect to the common signal center voltage Vcomc at the timing T1. It is set to a signal voltage that is positive (high level) with respect to the common signal center voltage Vcomc at timing T2.

  On the other hand, at the timings T1 and T2, since the display data writing operation is not performed on the sub display panel 10s side, each scanning line of the sub display panel 10s is based on the vertical control signal supplied from the LCD controller 50. Are applied with low level scanning signals S1s to S160s from the sub scanning driver 30s, and based on the polarity inversion signal FRPs supplied from the LCD controller 50, the common electrode of the sub display panel 10s has a sub main common. A sub-common signal voltage Vcoms having a high or low signal level is applied from the signal driving circuit 60s, and further, for example, at the same signal level (low level in FIG. 2) during the continuous timings T1 and T2. Control is performed so that the sub-common signal voltage Vcoms is continuously applied.

Next, at timing T3, the sub-scan driver 30s applies the high-level scan signal S1s to the first scan line of the sub-display panel 10s based on the vertical control signal supplied from the LCD controller 50.
In synchronization with the timing T3, a positive display signal voltage corresponding to the liquid crystal display pixels in the first row of the sub display panel 10s is applied simultaneously from the data driver 20 through each data line. The luminance signal is written in the first row of the sub display panel 10s. Here, the low-level sub-common signal voltage Vcoms is applied to the common electrode of the sub-display panel 10s from the sub-common signal drive circuit 60s. Thereby, the sub-common signal voltage Vcoms having the same signal level (low level) is continuously applied in the period of the timings T1 to T3.

  On the other hand, at the timing T3, the display data writing operation is not performed on the main display panel 10m side. Therefore, based on the vertical control signal supplied from the LCD controller 50, each scanning line of the main display panel 10m The low level scanning signals S1m to S320m are applied from the main scanning driver 30m, and the main common signal driving circuit is connected to the common electrode of the main display panel 10m based on the polarity inversion signal FRPm supplied from the LCD controller 50. A main common signal voltage Vcomm having a signal level of 60 m to either high or low (low level in FIG. 2) is applied.

Next, at timings T4 and T5, the main scanning driver 30m sequentially applies high-level scanning signals S3m and S4m to the third and fourth scanning lines of the main display panel 10m based on the vertical control signal.
In synchronization with this timing, a positive display signal voltage corresponding to the liquid crystal display pixels in the third row of the main display panel 10m from the data driver 20 at the timing T4, and the fourth row of the main display panel 10m at the timing T5. A predetermined luminance signal is sequentially written in the third and fourth rows by applying negative display signal voltages corresponding to the liquid crystal display pixels simultaneously through the respective data lines. Here, the main common signal voltage Vcomm, which is low level at the timing T4 and high level at the timing T5, is sequentially applied from the main common signal driving circuit 60m to the common electrode of the main display panel 10m. Thereby, the main common signal voltage Vcomm having the same signal level (low level) is continuously applied in the period of the timings T3 and T4.

  That is, paying attention to the timings T1, T2, T4, T5, T7, T8,..., Positive and negative display signal voltages are alternately applied to the pixel electrodes of the liquid crystal display pixels in each row of the main display panel 10m. At the same time, the low-level and high-level main common signal voltage Vcomm is alternately applied to the common electrode of the main display panel 10m, and line (row) inversion driving is executed in the main display panel 10m. .

  On the other hand, at timings T4 and T5, on the side of the sub display panel 10s, low-level scanning signals S1s to S160s are applied to each scanning line from the sub scanning driver 30s based on the vertical control signal, and the polarity inversion signal FRPs. The sub-common signal voltage Vcoms having either a high or low signal level (high level in FIG. 2) is continuously applied from the sub-common signal drive circuit 60s to the common electrode.

Next, at timing T6, the sub-scan driver 30s applies the high-level scan signal S2s to the second scan line of the sub-display panel 10s based on the vertical control signal.
In synchronization with this timing T6, a negative display signal voltage corresponding to the liquid crystal display pixels in the second row of the sub display panel 10s is applied simultaneously from the data driver 20 via each data line, thereby obtaining a predetermined value. The luminance signal is written in the second row of the sub display panel 10s. Here, the high level sub-common signal voltage Vcoms is applied to the common electrode of the sub-display panel 10s from the sub-common signal drive circuit 60s. Thereby, the sub-common signal voltage Vcoms having the same signal level (high level) is continuously applied in the period of the timings T4 to T6.

  That is, paying attention to the above-described timings T3, T6, T9,..., The positive and negative display signal voltages are alternately applied to the pixel electrodes of the liquid crystal display pixels in each row of the sub display panel 10s. A low level and a high level sub-common signal voltage Vcoms are alternately applied to the common electrode of the sub display panel 10s, and line (row) inversion driving is executed in the sub display panel 10s.

  On the other hand, at the timing T6, on the main display panel 10m side, the low-level scanning signals S1m to S320m are applied from the main scanning driver 30m to each scanning line of the main display panel 10m based on the vertical control signal. Based on the polarity inversion signal FRPm, a main common signal voltage Vcomm having either a high or low signal level (high level in FIG. 2) is applied from the main common signal driving circuit 60m to the common electrode of the main display panel 10m. Is done. Accordingly, the main common signal voltage Vcomm having the same signal level (high level) is continuously applied in the period of the timings T5 and T6.

  In the following, by selectively driving the scanning lines for two rows of the main display panel 10m and then selectively driving the scanning lines for one row of the sub display panel 10s, the same control operation is alternately repeated until timing T480. In one scanning period (display period) within one frame period, a desired luminance signal (display signal) is displayed on both the main display panel 10m having 320 scanning lines and the sub display panel 10s having 160 scanning lines. Voltage) can be written and displayed as image information.

  Further, regarding the display signal voltage, the main common signal voltage Vcomm, and the sub-common signal voltage Vcoms applied to the liquid crystal display pixels (pixel electrodes and common electrodes) in each row of the main display panel 10m and the sub display panel 10s in the one scanning period described above. By assigning odd timings (for example, 3 timings) to the vertical blanking period (non-display period) provided after the end of one scanning period within one frame period with the same time width as the timings T1 to T480 in the scanning period. The signal polarities in the next one frame period (scanning period) are inverted, and frame inversion driving is executed in the main display panel 10m and the sub display panel 10s.

  2, for example, when the sub display panel 10s is driven to scan, the signal polarity of the main common signal voltage Vcomm on the main display panel 10m side is set to the signal of the sub common signal voltage Vcoms of the sub display panel 10s. The signal polarity of the sub-common signal voltage Vcoms on the sub-display panel 10s side when the main display panel 10m is scan-driven is set to the same polarity as the polarity, and the sub-common signal of the sub-display panel 10s at the next scan-drive By setting the same polarity as the signal polarity of the voltage Vcoms, the number of times of inversion driving of the main common signal voltage Vcomm applied to the main display panel 10m when both display panels are scanned and driven in one scanning period is set to the main display panel 10m. The number of scanning lines can be the same as the number of scanning lines applied to the sub display panel 10s. The inversion driving number of the tone signal voltage Vcoms, can be the same as the number of scan lines of the sub-display panel 10s.

  Note that when scanning one display panel, the signal polarity of the common signal voltage applied to the common electrode of the other display panel is equal to the common signal voltage applied to the common electrode of one display panel as described above. For example, the signal polarity may be set to the opposite polarity, or may be set to the opposite polarity only once every predetermined number of times. In short, there is no bias in the sum of signal polarities of each common signal voltage during a luminance signal writing period (one scanning period) for one screen in the main display panel and the sub display panel (that is, positive polarity and negative polarity). Other methods may be applied as long as the number of times is set to be the same.

Therefore, in a conventional display device having two display panels, when a luminance signal is written by sequentially scanning each display panel using a frame inversion driving method and a line inversion driving method, each display panel has a common electrode. Any of the common signal voltages applied to the display panel needs to be inverted and driven by the number of times corresponding to the total number of scanning lines arranged in both display panels. The display device according to the present embodiment and the display device According to the display drive means (the configuration excluding at least the main display panel and the sub display panel among the components of the display device shown in FIG. 1) and the drive control method thereof, a common signal is generated on the main display panel side. The voltage may be inverted and driven a number of times corresponding to the number of scanning lines provided on the main display panel. Therefore, it is only necessary to invert the signal voltage by the number of times corresponding to the number of scanning lines arranged on the sub display panel, so that the driving cycle (frequency) related to the inversion driving of the common signal voltage is reduced and the power consumption is reduced. Can be achieved.
In addition, since the main display panel and the sub display panel can be driven by frame inversion driving and line inversion driving, it is possible to suppress deterioration of the liquid crystal constituting the display pixel, burn-in, display image quality deterioration due to flicker, and the like. .

<Second Embodiment>
Next, a second embodiment of the drive control operation in the display device having the above-described configuration will be described with reference to the drawings.
FIG. 3 is a timing chart showing a second embodiment of the drive control operation (drive control method) in the liquid crystal display device according to the present invention. Note that the description of the control operation equivalent to that of the above-described first embodiment is simplified or omitted.

  In the present embodiment, in the display device having the above-described configuration (see FIG. 1), the number of scanning lines arranged on the main display panel 10m is 320, and the number of scanning lines arranged on the sub display panel 10s is. A case where the number is set to 107 and the ratio of the panel size (number of scanning lines) is approximately 3: 1 will be described. Also in this embodiment, the number of data lines is arbitrary, and is assumed to be the same here.

  As shown in FIG. 3, in the driving control method of the display device according to the present embodiment, in one scanning period within one frame period, first, one row of the main display panel 10m is sent from the main scanning driver 30m at timings T1 to T3. High-level scanning signals S1m to S3m are sequentially applied to the first to third scanning lines.

  In synchronization with each of the timings T1 to T3, display signal voltages corresponding to the liquid crystal display pixels in the first to third rows of the main display panel 10m are sequentially applied from the data driver 20 through the data lines. As a result, predetermined luminance signals are sequentially written in the first to third rows of the main display panel 10m.

  Here, the display signal voltages applied from the data driver 20 at the timings T1 to T3 are set to signal voltages having positive, negative, and positive polarities, respectively, and from the main common signal driving circuit 60m to the main display panel. The main common signal voltage Vcomm applied to the 10 m common electrode is set to a signal voltage having negative, positive, and negative polarities, respectively.

  On the other hand, at the timings T1 to T3, since the display data writing operation is not performed on the sub display panel 10s side, the low level scanning signal S1s is supplied from the sub scanning driver 30s to each scanning line of the sub display panel 10s. To S107s, and the sub-common signal voltage Vcoms at either the high or low signal level (low level in FIG. 3) from the sub-main common signal driving circuit 60s continues to the common electrode of the sub-display panel 10s. Applied.

Next, at timing T4, a high level scanning signal S1s is applied from the sub scanning driver 30s to the first scanning line of the sub display panel 10s.
In synchronization with this timing T4, a positive display signal voltage corresponding to the liquid crystal display pixels in the first row of the sub display panel 10s is applied from the data driver 20 through each data line at the same time. The luminance signal is written in the first row of the sub display panel 10s. Here, a low-level sub-common signal voltage Vcoms is applied from the sub-common signal drive circuit 60s to the common electrode of the sub-display panel 10s, whereby the sub-common having the same signal level (low level) in the period of timing T1 to T4. The signal voltage Vcoms is continuously applied.

  On the other hand, at the timing T4, since the display data writing operation is not performed on the main display panel 10m side, low-level scanning signals S1m to S320m are applied to the scanning lines from the main scanning driver 30m. A main common signal voltage Vcomm having either a high or low signal level (low level in FIG. 3) is applied to the common electrode of the main display panel 10m from the main common signal driving circuit 60m. Thereby, the main common signal voltage Vcomm having the same signal level (low level) is continuously applied in the period of the timings T3 and T4.

  Next, at timings T5 to T7, high-level scanning signals S4m to S6m are sequentially applied from the main scanning driver 30m to the fourth to sixth scanning lines of the main display panel 10m. In synchronization with each of T7, a display signal voltage corresponding to each of the liquid crystal display pixels in the fourth to sixth rows of the main display panel 10m is sequentially applied from the data driver 20 through each data line. Predetermined luminance signals are sequentially written in the fourth to sixth lines of the display panel 10m.

  Here, the display signal voltages applied from the data driver 20 at timings T5 to T7 are set to signal voltages having negative, positive, and negative polarities, respectively, and from the main common signal driving circuit 60m to the main display panel. The main common signal voltage Vcomm applied to the 10 m common electrode is set to a signal voltage signal voltage having positive, negative, and positive polarities, respectively.

  That is, paying attention to the timings T1 to T3, T5 to T7, T9, and so on, positive and negative display signal voltages are alternately applied to the pixel electrodes of the liquid crystal display pixels in each row of the main display panel 10m. At the same time, the low-level and high-level main common signal voltage Vcomm is alternately applied to the common electrode of the main display panel 10m, and line (row) inversion driving is executed in the main display panel 10m.

  On the other hand, at timings T5 to T7, on the side of the sub display panel 10s, the sub scanning driver 30s applies the low level scanning signals S1s to S107s to each scanning line and drives the sub common signal based on the polarity inversion signal FRPs. The sub-common signal voltage Vcoms having either a high or low signal level (high level in FIG. 3) is continuously applied from the circuit 60s to the common electrode.

Next, at timing T8, the high level scanning signal S2s is applied from the sub scanning driver 30s to the second scanning line of the sub display panel 10s.
In synchronization with this timing T8, a negative display signal voltage corresponding to the liquid crystal display pixels in the second row of the sub display panel 10s is applied simultaneously from the data driver 20 through each data line, whereby a predetermined value is obtained. The luminance signal is written in the second row of the sub display panel 10s. Here, a high-level sub-common signal voltage Vcoms is applied from the sub-common signal drive circuit 60s to the common electrode of the sub-display panel 10s, whereby the sub-common having the same signal level (high level) in the period of timing T5 to T8. The signal voltage Vcoms is continuously applied.

  That is, paying attention to the above-described timings T4, T8,..., The positive and negative display signal voltages are alternately applied to the pixel electrodes of the liquid crystal display pixels in each row of the sub display panel 10s, and the sub display. Low-level and high-level sub-common signal voltage Vcoms is alternately applied to the common electrode of panel 10s, and line (row) inversion driving is also performed in sub-display panel 10s.

  On the other hand, at the timing T8, on the main display panel 10m side, the low-level scanning signals S1m to S320m are applied to the scanning lines from the main scanning driver 30m, and the main common signal driving circuit 60m is applied to the common electrode. A main common signal voltage Vcomm having either a high or low signal level (high level in FIG. 3) is applied. Thereby, the main common signal voltage Vcomm having the same signal level (high level) is continuously applied in the period of the timings T7 and T8.

  Hereinafter, after the scanning lines for three rows of the main display panel 10m are selectively driven, the scanning lines for one row of the sub display panel 10s are selectively driven at timing T428 (timing T427 is for timing adjustment). The main display panel 10m having 320 scanning lines and the sub-display panel having 107 scanning lines in one scanning period (display period) within one frame period are repeatedly executed repeatedly until the dummy period). A desired luminance signal (display signal voltage) can be written in both of 10 s and displayed as image information.

  Further, according to the drive control method in one frame period (one scanning period) described above, the display signal voltage applied to the liquid crystal display pixels (pixel electrodes and common electrodes) in each row of the main display panel 10m and the sub display panel 10s, and The signal polarities of the main common signal voltage Vcomm and the sub common signal voltage Vcoms are inverted in the next frame period, and frame inversion driving is executed in the main display panel 10m and the sub display panel 10s.

  As shown in FIG. 3, for example, when the sub display panel 10s is driven to scan, the signal polarity of the main common signal voltage Vcomm on the main display panel 10m side is set as the signal of the sub common signal voltage Vcoms of the sub display panel 10s. The signal polarity of the sub-common signal voltage Vcoms on the sub-display panel 10s side when the main display panel 10m is scan-driven is set to the same polarity as the polarity, and the sub-common signal of the sub-display panel 10s at the next scan-drive By setting the same polarity as the signal polarity of the voltage Vcoms, the number of inversion drives of the main common signal voltage Vcomm applied to the main display panel 10m in one scanning period is made the same as the number of scanning lines of the main display panel 10m. In addition, the number of inversion drives of the sub-common signal voltage Vcoms applied to the sub-display panel 10s can be reduced. It can be the same as the number of scanning lines of the display panel 10s.

  Therefore, even when the panel size (the number of scanning lines) of the main display panel and the sub display panel is set to 3: 1, the main display panel and the sub display panel are individually provided as in the first embodiment. The common signal voltage to be applied to each of the main display panel and the sub display panel may be inverted and driven by the number of times corresponding to the number of scanning lines. ) To reduce power consumption, and the main display panel and the sub display panel can be frame-inverted and line-inverted. Deterioration of display image quality due to image sticking or flicker can be suppressed.

<Third Embodiment>
Next, a third embodiment of the drive control operation in the display device having the above-described configuration will be briefly described with reference to the drawings.
FIG. 4 is a timing chart showing a third embodiment of the drive control operation (drive control method) in the liquid crystal display device according to the present invention. In addition, about the control operation equivalent to 1st and 2nd embodiment mentioned above, the description is simplified or abbreviate | omitted.

  In the present embodiment, in the display device having the above-described configuration (see FIG. 1), the number of scanning lines arranged on the main display panel 10m is 320, and the number of scanning lines arranged on the sub display panel 10s is. A case where the number of panels is set to 80 and the ratio of panel sizes (number of scanning lines) is 4: 1 will be described.

  As shown in FIG. 4, the display device drive control method according to the present embodiment starts from the main scanning driver 30m to the first row of the main display panel 10m at timings T1 to T4 in one scanning period within one frame period. High-level scanning signals S1m to S4m are sequentially applied to the fourth scanning line, and at timings T1 to T4, the data driver 20 corresponds to the liquid crystal display pixels of the first to fourth rows. By sequentially applying the display signal voltage via each data line, predetermined luminance signals are sequentially written in the first to fourth rows of the main display panel 10m.

  Next, at timing T5, the high-level scanning signal S1s is applied from the sub-scanning driver 30s to the first scanning line of the sub-display panel 10s. At the timing T5, the data driver 20 applies the first-row scanning signal S1s. A predetermined luminance signal is written to the first row of the sub display panel 10s by applying display signal voltages corresponding to the liquid crystal display pixels all at once through the respective data lines.

  Similarly, after the scanning lines for four rows of the main display panel 10m are selectively driven, the same control operation for selectively driving the scanning lines for one row of the sub display panel 10s is executed alternately until timing T400. As a result, in one scanning period (display period) within one frame period, a desired luminance signal (both in the main display panel 10m having 320 scanning lines and the sub display panel 10s having 80 scanning lines). Display signal voltage) can be written and displayed as image information.

  Also in the drive control operation as described above, as shown in FIG. 4, at timings T1 to T4, T6 to T9, T11 to..., The positive electrode is connected to the pixel electrode of the liquid crystal display pixel in each row of the main display panel 10m. The negative and positive display signal voltages are alternately applied, and the low level and high level main common signal voltage Vcomm are alternately applied to the common electrode of the main display panel 10m. , Line (row) inversion driving is executed.

  Further, at the timings T5, T10,..., The positive and negative display signal voltages are alternately applied to the pixel electrodes of the liquid crystal display pixels in each row of the sub display panel 10s, and the sub display panel 10s has the common characteristics. The low-level and high-level sub-common signal voltage Vcoms is alternately applied to the electrodes, and line (row) inversion driving is also performed in the sub-display panel 10s.

  Further, regarding the display signal voltage, the main common signal voltage Vcomm, and the sub-common signal voltage Vcoms applied to the liquid crystal display pixels (pixel electrodes and common electrodes) in each row of the main display panel 10m and the sub display panel 10s in the one scanning period described above. By assigning odd timings (for example, 5 timings) with the same time width as the timings T1 to T400 to the vertical blanking period (non-display period) in one frame period, the next one frame period (scanning period) The signal polarities of the signal are inverted, and frame inversion driving is executed in the main display panel 10m and the sub display panel 10s.

  As shown in FIG. 4, for example, when the sub display panel 10s is driven to scan, the signal polarity of the main common signal voltage Vcomm on the main display panel 10m side is set to the signal polarity of the sub common signal voltage Vcoms of the sub display panel 10s. In addition, the signal polarity of the sub-common signal voltage Vcoms on the sub-display panel 10s side when the main display panel 10m is driven to scan is set to the sub-common signal voltage of the sub-display panel 10s when it is next scanned and driven. By setting the same polarity as the signal polarity of Vcoms, the number of inversion drivings of the main common signal voltage Vcomm applied to the main display panel 10m in one scanning period can be made the same as the number of scanning lines of the main display panel 10m. The number of times of inversion driving of the sub-common signal voltage Vcoms applied to the sub-display panel 10s It can be the same as the number of scanning lines of the display panel 10s.

  Therefore, even when the panel size (number of scanning lines) of the main display panel and the sub display panel is set to 4: 1, the main display panel and the sub display are the same as in the first and second embodiments described above. The common signal voltage to be individually applied to the panel may be inverted and driven by the number of times corresponding to the number of scanning lines arranged on the main display panel or the sub display panel. The period (frequency) can be reduced to reduce power consumption, and the main display panel and the sub display panel can be frame-inverted and line-inverted, so that the liquid crystal constituting the display pixel Degradation of image quality, burn-in, display image quality degradation due to flicker, and the like can be suppressed.

<Fourth Embodiment>
Next, a fourth embodiment of the drive control operation in the display device having the above-described configuration will be briefly described with reference to the drawings.
FIG. 5 is a timing chart showing a fourth embodiment of the drive control operation (drive control method) in the liquid crystal display device according to the present invention. Note that description of control operations equivalent to those in the first to third embodiments described above is simplified or omitted.

  In the present embodiment, in the display device having the above-described configuration (see FIG. 1), the number of scanning lines arranged on the main display panel 10m is 160, and the number of scanning lines arranged on the sub display panel 10s is. A case will be described where 160 is set and the panel size (number of scanning lines) ratio is 1: 1.

  As shown in FIG. 5, the drive control method for the display device according to the present embodiment starts from the main scanning driver 30m at the timing T1, T3, T5,. High-level scanning signals S1m, S2m, S3m,... Are sequentially applied to the 10 m first, second, third,... Scanning lines, and timings T2, T4. , T6,..., High-level scanning signals S1s, S2s,... From the sub-scanning driver 30s to the first, second, third,. S3s,... Are sequentially applied.

Here, at timings T1, T3, T5,..., Display signals corresponding to the liquid crystal display pixels of the first row, the second row, the third row,. A voltage is sequentially applied via each data line, so that a predetermined luminance signal is sequentially written to each row of the main display panel 10m. At timings T2, T4, T6,. The display signal voltages corresponding to the liquid crystal display pixels in the first row, the second row, the third row,... Of the display panel 10s are sequentially applied through the data lines, so that the sub display panel 10s A predetermined luminance signal is sequentially written in each row.
As a result, in one scanning period (display period) within one frame period, a desired luminance signal (display signal voltage) is written to both the main display panel 10m and the sub display panel 10s each having 160 scanning lines, Displayed as image information.

  Also in the drive control operation as described above, as shown in FIG. 5, at the timings T1, T3, T5,..., The positive polarity and the negative polarity are applied to the pixel electrodes of the liquid crystal display pixels in each row of the main display panel 10m. Display signal voltage is alternately applied, and a low level and a high level main common signal voltage Vcomm are alternately applied to the common electrode of the main display panel 10m. (Row) Inversion driving is executed, and at timings T2, T4, T6,..., The positive and negative display signal voltages are alternately applied to the pixel electrodes of the liquid crystal display pixels in each row of the sub display panel 10s. In addition, a low level and a high level sub-common signal voltage Vcoms are alternately applied to the common electrode of the sub-display panel 10s. Also in Le 10s, line (line) inversion driving is performed.

  Further, regarding the display signal voltage, the main common signal voltage Vcomm, and the sub-common signal voltage Vcoms applied to the liquid crystal display pixels (pixel electrodes and common electrodes) in each row of the main display panel 10m and the sub display panel 10s in the one scanning period described above. By assigning odd timings (for example, 3 timings) with the same time width as the timings T1 to T320 to the vertical blanking period (non-display period) within one frame period, the next one frame period (scanning period) The signal polarities of the signal are inverted, and frame inversion driving is executed in the main display panel 10m and the sub display panel 10s.

  5, for example, when the sub display panel 10s is driven to scan, the signal polarity of the main common signal voltage Vcomm on the main display panel 10m side is the signal polarity of the sub common signal voltage Vcoms of the sub display panel 10s. In addition, the signal polarity of the sub-common signal voltage Vcoms on the sub-display panel 10s side when the main display panel 10m is driven to scan is set to the sub-common signal voltage of the sub-display panel 10s when it is next scanned and driven. By setting the same polarity as the signal polarity of Vcoms, the number of inversion drivings of the main common signal voltage Vcomm applied to the main display panel 10m in one scanning period can be made the same as the number of scanning lines of the main display panel 10m. The number of times of inversion driving of the sub-common signal voltage Vcoms applied to the sub-display panel 10s It can be the same as the number of scanning lines of the display panel 10s.

  In particular, when the ratio of the panel size (number of scanning lines) of the main display panel 10m and the sub display panel 10s is set to 1: 1 as in the present embodiment, as shown in FIG. 5, the main display panel 10m The main common signal voltage Vcomm applied to the sub-display panel 10s and the sub-common signal voltage Vcoms applied to the sub-display panel 10s can be inverted and driven at the same cycle, so that the main common signal drive circuit 60m and the sub-common signal drive circuit 60s are single. Since the configuration replaced with the common signal driving circuit can be applied, the circuit configuration of the display device can be simplified and downsized.

  Further, even when the panel size (the number of scanning lines) of the main display panel and the sub display panel is set to 1: 1, the common applied to the main display panel and the sub display panel is the same as in the above-described embodiments. Since the signal voltage has only to be inverted and driven the number of times corresponding to the number of scanning lines arranged on the main display panel or the sub display panel, the driving cycle (frequency) related to the inversion driving of the common signal voltage is reduced, The power consumption can be reduced.

  In each of the embodiments described above, a case has been described in which the display device according to the present invention includes two display panels each having a panel size (number of scanning lines) ratio of i: j (j = 1). However, the present invention is not limited to this. That is, the present invention only needs to apply a scanning signal to the scanning line group disposed on each of the two display panels at a timing according to the panel size (number of scanning lines) of the display panel. For example, even when the ratio of the panel sizes of the two display panels has a relationship of 3: 2, etc., it can be applied satisfactorily.

  For example, in the case of a display device including two display panels having a ratio of panel size (number of scanning lines) of 3: 2, one display is performed at successive operation timings (3 timings) in the drive control method described above. After the scanning signals are sequentially applied to the scanning lines for three rows of the panel (for example, the first to third rows of the main display panel 10m; i-th row) and selectively driven, at the next continuous operation timing (two timings). A control operation for selectively driving the scanning lines by sequentially applying scanning signals to the scanning lines of two rows of the other display panel (for example, the first and second rows of the sub display panel 10s; j rows) is performed between the two display panels. Repeat alternately with.

  Further, the ratio of the panel sizes of the two display panels may not be an integer ratio like i: j (i and j are positive integers) described above, and in this case, the ratio of the panel sizes is approximated. By using the integer ratio i: j and further arbitrarily setting the number of operation timings constituting the vertical blanking period so as to be frame inversion driving and line inversion driving, Similarly, power consumption can be reduced by reducing the number of times of inversion driving of the signal polarity of the common signal voltage applied to each display panel.

  Further, the first to third embodiments described above include a main display panel having a relatively large panel size (a large number of scanning lines) and a sub display panel having a relatively small panel size (a small number of scanning lines). In the above display device, the main display panel is driven by i-row scanning and then the sub-display panel is driven by j-row scanning. However, after the sub-display panel is driven by j-row scanning, the main display panel is driven by i-row scanning. It goes without saying that the operation may be controlled as described above.

  In addition, in the above-described embodiment, only the case where two display panels are provided has been described. However, the present invention is not limited to this, and even a display device including two or more display panels may be used. By applying the technical idea according to the present invention, the number of times of inversion driving of the signal polarity of the common signal voltage applied to each display panel can be reduced, and power consumption can be reduced.

1 is an overall configuration diagram showing an embodiment of a display device according to the present invention. 3 is a timing chart showing a first embodiment of a drive control operation (drive control method) in the liquid crystal display device according to the present invention. 6 is a timing chart showing a second embodiment of the drive control operation (drive control method) in the liquid crystal display device according to the present invention. 12 is a timing chart showing a third embodiment of the drive control operation (drive control method) in the liquid crystal display device according to the present invention. It is a timing chart which shows 4th Embodiment of the drive control operation | movement (drive control method) in the liquid crystal display device which concerns on this invention. It is a schematic block diagram which shows an example of the display apparatus provided with two display panels in a prior art. It is a timing chart which shows an example of the display drive control method of the display apparatus in a prior art. 10 is a timing chart when the display device according to the related art is driven to display by frame inversion and line inversion driving.

Explanation of symbols

10 m main display panel 10 s sub display panel 20 data driver 30 m main scan driver 30 s sub scan driver 40 display signal generation circuit 41 RGB decoder 42 inverting amplifier 50 LCD controller 60 m main common signal drive circuit 60 s sub common signal drive circuit Ld data line group Lsm, Lss scan line group Vcomm, Vcoms Common signal voltage

Claims (13)

  1. Provided with display means having a plurality of display panels in which a plurality of display pixels are two-dimensionally arranged, sequentially scans the display pixels in each row of the display panel, and inverts the display signal voltage and the common signal voltage based on a predetermined image signal In a display device that displays desired image information by driving and line inversion driving,
    In each of the plurality of display panels during at least one scanning period, a control operation of sequentially scanning the display pixels in a number of rows corresponding to the ratio of the number of scanning lines provided in each display panel, A display device comprising display drive means for alternately repeating between display panels.
  2. The display driving unit sets the number of times of inversion driving of the common signal voltage so that at least the sum of the signal polarities of the common signal voltage in the one scanning period is equal in each of the plurality of display panels. The display device according to claim 1, further comprising a common signal driving unit.
  3. The said common signal drive part sets the frequency | count of inversion drive of the said common signal voltage so that it may become the same as the number of the scanning lines provided in each of these display panels. Display device.
  4. The display driving means is connected to at least a signal line provided in common to the plurality of display panels, and applies only the display signal voltage, and the display driving means is provided for each of the plurality of display panels. 4. The display device according to claim 1, further comprising: an individual scan driving unit that is connected to a scan line and scans the display pixels by sequentially applying a scan signal. 5.
  5. The display device according to claim 4, wherein the display driving unit includes at least a control unit that controls an operation state of the signal driving unit, the scanning driving unit, and the common signal driving unit.
  6. The display means includes at least a first display panel and a second display panel in which the ratio of the number of scanning lines is i: j (i and j are arbitrary positive integers),
    The display driving means sequentially scans the display pixels for i rows in the first display panel during the one scanning period, and sequentially displays the display pixels for j rows in the second display panel. 6. The display device according to claim 1, wherein the scanning operation is controlled to be repeated alternately.
  7. The display means includes at least a first display panel and a second display panel in which a ratio of the number of scanning lines approximates to i: j (i and j are arbitrary positive integers),
    The display driving means sequentially scans the display pixels for i rows in the first display panel during the one scanning period, and sequentially displays the display pixels for j rows in the second display panel. 6. The display device according to claim 1, wherein the scanning operation is controlled to be repeated alternately.
  8. The common signal driving unit sets a signal polarity of a second common signal voltage applied to a common electrode of the second display panel during the period of scanning the display pixels of the first display panel. The display pixel of the second display panel is set to the same polarity as the signal polarity of the second common signal voltage at the next scan, and the display pixel of the second display panel is scanned during the period of scanning the display pixel. 8. The signal polarity of the first common signal voltage applied to the common electrode of one display panel is set to the same polarity as the signal polarity of the second common signal voltage. Display device.
  9. Provided with display means having a plurality of display panels in which a plurality of display pixels are two-dimensionally arranged, sequentially scans the display pixels in each row of the display panel, and frame-inverts display signal voltages and common signal voltages based on predetermined image signals In a drive control method for a display device that displays desired image information by driving and line inversion driving,
    In each of the plurality of display panels during at least one scanning period, a control operation of sequentially scanning the display pixels in a number of rows corresponding to the ratio of the number of scanning lines provided in each display panel, Processing that alternates between display panels,
    When scanning the display pixels of the plurality of display panels, the number of times of inversion driving of the common signal voltage is set so that the sum of the signal polarities of the common signal voltage is equalized in each of the plurality of display panels. Process to set,
    A drive control method for a display device, comprising:
  10. In the process of setting the number of times of inversion driving of the common signal voltage, the number of times of inversion driving of the common signal voltage is set to be equal to the number of scanning lines provided in each of the plurality of display panels. A drive control method for a display device according to claim 9.
  11. The display means includes at least a first display panel and a second display panel in which the ratio of the number of scanning lines is i: j (i and j are arbitrary positive integers),
    In each of the plurality of display panels, the process of alternately repeating the control operation of sequentially scanning the display pixels is performed by sequentially scanning the display pixels for i rows in the first display panel during the one scanning period. 11. The display device drive control method according to claim 9 or 10, wherein an operation of performing the above operation and an operation of sequentially scanning the display pixels for j rows in the second display panel are alternately repeated.
  12. The display means includes at least a first display panel and a second display panel in which a ratio of the number of scanning lines approximates to i: j (i and j are arbitrary positive integers),
    In each of the plurality of display panels, the process of alternately repeating the control operation of sequentially scanning the display pixels is performed by sequentially scanning the display pixels for i rows in the first display panel during the one scanning period. 11. The display device drive control method according to claim 9 or 10, wherein an operation of performing the above operation and an operation of sequentially scanning the display pixels for j rows in the second display panel are alternately repeated.
  13. The process of setting the number of times of inversion driving of the common signal voltage includes a second common signal voltage applied to the common electrode of the second display panel during a period of scanning the display pixels of the first display panel. Is set to the same polarity as the signal polarity of the second common signal voltage when the display pixel of the second display panel is scanned next time, and the display pixel of the second display panel is scanned. In this period, the signal polarity of the first common signal voltage applied to the common electrode of the first display panel is set to the same polarity as the signal polarity of the second common signal voltage. The drive control method of the display apparatus of Claim 11 or 12.
JP2004142201A 2004-05-12 2004-05-12 Display device and drive control method thereof Expired - Fee Related JP4501525B2 (en)

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JP2004142201A JP4501525B2 (en) 2004-05-12 2004-05-12 Display device and drive control method thereof
KR1020057024664A KR100792087B1 (en) 2004-05-12 2005-05-11 Driving method of deplay device having main display and sub display
CN 200580000532 CN1806274B (en) 2004-05-12 2005-05-11 Driving method of display device having main display and sub display
EP20050741329 EP1634271A1 (en) 2004-05-12 2005-05-11 Driving method of deplay device having main display and sub display
CN 200910130273 CN101533630B (en) 2004-05-12 2005-05-11 Driving method of deplay device having main display and sub display
TW94115209A TWI307487B (en) 2004-05-12 2005-05-11 Display device and electric machine
US11/128,139 US7671830B2 (en) 2004-05-12 2005-05-11 Electronic apparatus with display device
PCT/JP2005/009019 WO2005109395A1 (en) 2004-05-12 2005-05-11 Driving method of deplay device having main display and sub display
HK07100219A HK1093255A1 (en) 2004-05-12 2007-01-05 Driving method of display device having main display and sub display

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007142190A1 (en) * 2006-06-09 2007-12-13 Sharp Kabushiki Kaisha Display drive circuit and display
WO2015173954A1 (en) * 2014-05-16 2015-11-19 富士通株式会社 Drawing device, drawing method, and computer program for drawing

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3541891B2 (en) * 2002-03-15 2004-07-14 日本電気株式会社 Connector with dustproof mechanism
JP4501525B2 (en) * 2004-05-12 2010-07-14 カシオ計算機株式会社 Display device and drive control method thereof
EP1717782B1 (en) * 2005-04-27 2008-10-22 LG Display Co., Ltd. Dual panel apparatus and method of driving the same
JP4561557B2 (en) * 2005-09-22 2010-10-13 株式会社デンソー Liquid crystal display device and vehicle periphery monitoring device
KR100635511B1 (en) * 2005-09-30 2006-10-11 삼성에스디아이 주식회사 Organic electroluminescent display device
CN101322170B (en) * 2005-12-02 2012-10-10 株式会社半导体能源研究所 Display module and electronic device using the same
US20070152955A1 (en) * 2005-12-29 2007-07-05 Nokia Corporation Reduced power consumption display panel
US7439679B2 (en) * 2006-03-16 2008-10-21 Motorola, Inc. Method and apparatus for illuminating light sources within an electronic device
CN100550114C (en) 2006-07-26 2009-10-14 盛群半导体股份有限公司 Planar display driving method
US20080036720A1 (en) * 2006-08-09 2008-02-14 Foo Ken K System and method for driving a liquid crystal display to reduce audible noise levels
KR20080037754A (en) * 2006-10-27 2008-05-02 삼성전자주식회사 Liquid crystal display device and driving mathod thereof
KR20090054836A (en) * 2007-11-27 2009-06-01 삼성전자주식회사 The apparatus for displaying image and the method thereof
JP4737562B2 (en) * 2008-06-19 2011-08-03 ソニー株式会社 Information processing apparatus and method, and program
KR101751352B1 (en) * 2010-10-29 2017-06-28 삼성디스플레이 주식회사 Method of driving display panel and display apparatus for performing the method
TWI451393B (en) * 2011-10-14 2014-09-01 Sitronix Technology Corp A driving method of a liquid crystal display device and a driving circuit thereof
KR20140052454A (en) * 2012-10-24 2014-05-07 삼성디스플레이 주식회사 Scan driver and display device comprising the same
KR20160119901A (en) * 2015-04-06 2016-10-17 삼성디스플레이 주식회사 Display device
JP2017003982A (en) * 2015-06-08 2017-01-05 株式会社半導体エネルギー研究所 Semiconductor device, display module, and electronic device
KR20170026714A (en) * 2015-08-26 2017-03-09 엘지디스플레이 주식회사 Display Device
US10354569B2 (en) * 2017-02-08 2019-07-16 Microsoft Technology Licensing, Llc Multi-display system

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003323164A (en) * 2002-05-08 2003-11-14 Hitachi Displays Ltd Liquid crystal display device and its driving method
JP2004061892A (en) * 2002-07-30 2004-02-26 Hitachi Device Eng Co Ltd Liquid crystal display
JP2004070218A (en) * 2002-08-09 2004-03-04 Sanyo Electric Co Ltd Display device
JP2004070224A (en) * 2002-08-09 2004-03-04 Sanyo Electric Co Ltd Display device
JP2004163790A (en) * 2002-11-15 2004-06-10 Hitachi Displays Ltd Image display device

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR957000585A (en) 1992-03-20 1995-01-16 토마스 에프, 물바니 vga controller and the method of using the address translation in order to drive the dual-scan panel lcd
TW277129B (en) 1993-12-24 1996-06-01 Sharp Kk
JP3476241B2 (en) 1994-02-25 2003-12-10 株式会社半導体エネルギー研究所 Display method of active matrix type display device
JPH09130708A (en) 1995-10-31 1997-05-16 Victor Co Of Japan Ltd Liquid crystal image display device
US6084562A (en) * 1997-04-02 2000-07-04 Kabushiki Kaisha Toshiba Flat-panel display device and display method
JP3879484B2 (en) * 2001-10-30 2007-02-14 株式会社日立製作所 Liquid crystal display
TWI266106B (en) * 2002-08-09 2006-11-11 Sanyo Electric Co Display device with a plurality of display panels
JP4794801B2 (en) * 2002-10-03 2011-10-19 ルネサスエレクトロニクス株式会社 Display device for portable electronic device
JP4145637B2 (en) * 2002-11-25 2008-09-03 シャープ株式会社 Active matrix substrate and display device
KR100957574B1 (en) * 2003-09-17 2010-05-11 삼성전자주식회사 Display apparatus
JP4501525B2 (en) * 2004-05-12 2010-07-14 カシオ計算機株式会社 Display device and drive control method thereof

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003323164A (en) * 2002-05-08 2003-11-14 Hitachi Displays Ltd Liquid crystal display device and its driving method
JP2004061892A (en) * 2002-07-30 2004-02-26 Hitachi Device Eng Co Ltd Liquid crystal display
JP2004070218A (en) * 2002-08-09 2004-03-04 Sanyo Electric Co Ltd Display device
JP2004070224A (en) * 2002-08-09 2004-03-04 Sanyo Electric Co Ltd Display device
JP2004163790A (en) * 2002-11-15 2004-06-10 Hitachi Displays Ltd Image display device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007142190A1 (en) * 2006-06-09 2007-12-13 Sharp Kabushiki Kaisha Display drive circuit and display
WO2015173954A1 (en) * 2014-05-16 2015-11-19 富士通株式会社 Drawing device, drawing method, and computer program for drawing

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US7671830B2 (en) 2010-03-02
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